Stove or furnace grate-bar



(No Model.) v

` C. D. HOWARD. STOVE OR FURNACE GRATE BAR.

No. 591,371. Patented Oct. 5,1897.

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"UNITED STATRs lPATENT- cnARLEs D. i-giOwARD, or sYRAOUsE, NEW, YORK.

STOVEk-OR FU RNACE G RATE-BAR.

SPECIFICATION forming" part of Letters Patent No. 591 ,3'171 dated. October 5, 1897. Application filed April 5, 1897. Serlal No. 630,791. (No model.)

Toall whom it may concern.-

Beit kno-wn that I, CHARLES D. HOWARD, a

- citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented certain new and useful Improvements in Stove or Furnace Grate-Bars; and I do hereby declare the fol- Aout in the claims.

In the accompanying drawings, Figure lis a perspective view of a portion of my improved grate-bar; Fig. 2, a plan view showing one ofthe fuel-bearing surfaces; Fig. 3, a similar view looking at the edge of one of the iianges or wings, and Fig. 4 a cross-section on the line 3 3 of FigLZ.

Referring to the severalviews of the drawings, the numeral 1 indicates the bar, which,

in addition to the usual journal or bearing ends, comprises a core 2 and four longitudinal spines or flanges 3,l 4.-, 5, and 6, arranged, preferably, in pairs or sets. The core 2 is formed with two series of air-supply openings 7 and 8, passing transversely therethrough, the direction of one series being substantially at right angles to that of the other, and the openings of one seriesalternating with those of the other. The spines or flanges are of serpentine form and are so disposed upon the core that the concave and convex surfaces of each stand substantially opposite to the concave and convex surfaces, respectively, of the adjoining ones. In other words, the direction of each at every point is contrary to that of the adjoining one at an opposite point. The spines or ianges are so arranged relative to the openings through the core that their concave surfaces substantially conform to the edges of the openings, and said openings are flared from the center of the core outward, as shown at 9, the sides of the openings being made to aline with the concave surfaces of the spines or flanges, said concave surfaces being in effect a continuation of said openings. By this construction the inflowing air meets with but little friction, and there are no abrupt surfaces for the lodginent of ashes and'V clinkers.

T The spines or iianges have a threefold purpose: first, to support the incandescent fuel away from the main body of the bar; second, to present an extended surface to the inflowing air, thereby heating the air and at the same time keeping the bar cool, resulting in its preservation, and, third, to add to the strength of the bar. By the serpentine form of said spines or flanges and their arrangement in relation to the openings, as above described, the bar is protected against warping and twisting and the openings through the core can be made much larger than when the spines orflanges are straight without being interfered with thereby, and at the same time without materially weakening the structure, giving all of the advantages of a skeleton form of bar without the disadvantage of weakness of struc-ture usual in bars of this type. In operation the bar is turned on its axis when necessary to clear its upper surface of ashes and clinkers, and in whatever position it may be left there are free passages therethrough for air, resulting in the cooling of the bar and the heating of the air.

While I have shown my invention as applied to a rotatory type of bar, yet I do not wish to be understood as so limiting it. Neither do I wish it to b e understood that my invention is to be limited to two series of openings and two sets or pairs of spines or flanges, as the number of series of openings and the number of sets or pairs of spines or ilan ges may be increased or diminished withlout departing from the broad principle of my invention.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. A grate-bar comprising a core and serpentine spines or iianges, the core being provided with lateral passages and the spines or flanges being so disposed'that the opposite concave surfaces of adjoining ones will substantially surround said passages.

IOO

2. A grate-bar comprising a core and serpentine spines or flanges, the core being provided with lateral passages and the spines or flanges being so disposed, relative thereto, that their concave surfaces will substantially surround and aline with the sides of said passages.

3. A grate-bar comprising a core and serpentine spines or flanges, the core being provided with lateral passages flaring from the center of the core outward, and the spines or flanges being so disposed, relative thereto, that their concave surfaces will aline with the sides of the passages.

4. A grate-bar comprising a core and two sets or pairs of spines or flanges, the core being provided with two series of passages, the passages of one series being at right angles to those of the other series and the spines or flanges of each set 0r pair being so disposed relative to each other and to the adjoining spines or flanges of the other set or pair that all convex surfaces of each spine or flange will stand opposite to convex surfaces and all concave surfaces of each spine or flange will stand opposite to concave surfaces of adjoining spines or flanges, and the concave surfaces being so arranged relative to said passages as to substantially surround the saine.

5. A grate-bar comprising a core and two pairs or sets of spines or flanges, the core being provided with two series of passages, the passages of one series being at right angles to those of the other series and the passages of one series alternating with those of the other, and the spines or flanges of each pair or set being so disposed, relative to each other and to the adjoining spines or flanges of the other pair or set, that all convex surfaces of each spine or flange will stand opposite to convex surfaces and all concave surfaces of each spine or flange will stand opposite to concave surfaces of adjoining spines or flanges, and the concave surfaces being so arranged relative to said passages as to substantially surround the same and to aline with the sides thereof.

In testimony whereof I affix iny signature in the presence of two Witnesses.

CHARLES D. IIO\VARD.

Witnesses:

F. H. MOORE, L. Il. NORTON. 

